Unity - Reorderable List is never focused or selected-CodePudding

I have a custom Editor where I use a Reorderable List. Its elements are never focused nor selected whether I use a custom method or the default ones. Here's my code:

public class CustomClass : ScriptableObject
{
    [SerializeFied] List<int> _startingElements = new List<int>();
}

[CustomEditor(typeof(CustomClass), true)]
    ReorderableList _reorderableStartingElements;

public override void OnInspectorGUI()
{          
    GUIStyle HeaderBackground = new GUIStyle("RL Header");

    Rect position = EditorGUILayout.GetControlRect(false, 7.5f);
    position.height = EditorGUIUtility.singleLineHeight;

    _reorderableStartingElements = new ReorderableList(serializedObject, serializedObject.FindProperty("_startingElements"), true, true, true, true)
    {
         drawElementBackgroundCallback = DrawListElementBackground,
         elementHeight = 19,
         elementHeightCallback = CalculateCallHeight
    };

    _reorderableStartingElements.DoLayoutList();

    serializedObject.ApplyModifiedProperties();
}
      
private float CalculateCallHeight(int index)
{
    return EditorGUI.GetPropertyHeight(_reorderableStartingElements.serializedProperty.GetArrayElementAtIndex(index));
}

public void DrawListElementBackground(Rect rect, int index, bool selected, bool focused)
{
    if (Event.current.type != EventType.Repaint)
         return;

    GUIStyle HeaderBackground = new GUIStyle("RL Header");

    Color[] pix = new Color[Mathf.FloorToInt(rect.width * rect.height)];
          
    for (int i = 0; i < pix.Length; i  )
         pix[i] = selected || focused ? Color.blue : index % 2 == 0 ? Color.cyan : Color.yellow;
          
    Texture2D result = new Texture2D((int)rect.width, (int)5);
    result.SetPixels(pix);
    result.Apply();
          
    HeaderBackground.normal.background = result;
    EditorGUI.LabelField(rect, "", HeaderBackground);

    //ReorderableList.defaultBehaviours.elementBackground.Draw(rect, false, selected, selected, focused);
}

_startingElements is a simple List<int>. I left the comment where I use the default ReorderableList Draw method without succeess.

I know the code is not optimized, I'm just trying to make work it first.

CodePudding user response：

Move the initialization to OnEnable, and use OnInspectorGUI to draw the list.

private void OnEnable()
{
    _reorderableStartingElements = new ReorderableList(serializedObject, serializedObject.FindProperty("_startingElements"), true, true, true, true)
    {
         drawElementBackgroundCallback = DrawListElementBackground,
         elementHeight = 19,
         elementHeightCallback = CalculateCallHeight
    };
}
private void OnInspectorGUI()
{
    serializedObject.Update();

    _reorderableStartingElements.DoLayoutList();

    serializedObject.ApplyModifiedProperties();
}